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Abstract Storm-dominated siliciclastic shelf deposits in the upper half of the Upper Tiouririne Formation (Upper Ordovician, upper Berounian– c. Katian 1–2) of southern Morocco contain large specimens of at least two species of Archaeoconularia ( A . aff. consobrina and A . cf. imperialis ). Pseudoconularia cf. grandissima occurs in basal beds of the formation, but is far less abundant than Archaeoconularia . The large size of the Archaeoconularia (>500 mm long in some cases) suggests gigantism induced by cold, nutrient-rich waters. Specimens preserving the apical end terminate in a schott, indicating that the conulariids were severed near the apex prior to final burial. Many of the Archaeoconularia occur in monospecific aggregations in which the component specimens exhibit preferential alignment, probably owing to entrainment and burial by storm currents or flows. Some Archaeoconularia are encrusted by edrioasteroids and/or craniid brachiopods, which in certain cases are so closely spaced as to interfere with growth. The edrioasteroids and brachiopods were probably epibionts attached to living, erect or semi-erect conulariids that were partially infaunal. More generally, Late Ordovician conulariid assemblages of South Polar Gondwana and adjacent terranes exhibit low generic diversity relative to those of low- to mid-latitude terranes (Baltica and Laurentia), and are dominated numerically by Archaeoconularia .
Abstract Upper Ordovician planktic and benthic graptolites are generally rare in North Africa. Four localities in southern Morocco have yielded graptolitic material from the top of the First Bani Group and the Lower Ktaoua, Upper Tiouririne and Upper Ktaoua formations, the lithostratigraphic units that contain the Tafilalt Biota. Three species of planktic graptolite (in the genera Climacograptus , Diplograptus ? and Neodiplograptus ), six species of benthic graptolite (in the genera Dendrograptus , Callograptus , Ptilograptus and ‘ Dictyonema ’) and one probable hydroid ( Webbyites ? sp.) are described from these sites. Two species are new: ‘ Dictyonema ’ khadijae sp. nov. and ‘ Dictyonema ’ villasi sp. nov. Another probable hydroid, a Plumalina -like form from the Lower Ordovician Fezouata Formation, is also illustrated. Some of the Tafilalt graptolites are similar to Bohemian species, indicating faunal links between the regions during the Late Ordovician. The graptolite dating of some isolated localities helps to evaluate the chronostratigraphic and lithostratigraphic assignment of those outcrops, implying an earlier appearance of the ‘ Dendrocystites fauna’ (echinoderm-dominated: c. Sandbian 2–Katian 1) and a late placement for the ‘ Declivolithus fauna’ (trilobite-dominated: c. Katian 2).
Onuphionella corusca sp. nov.: an early Cambrian-type agglutinated tube from Upper Ordovician strata of Morocco
Abstract A variety of unrelated organisms produce agglutinated tubes as dwelling structures, and the habit has persisted since the Neoproterozoic. Onuphionella , an agglutinated tube composed of mica flakes, has been found in lower Cambrian strata on several palaeocontinents. In this paper, a new species of the genus, Onuphionella corusca sp. nov., is described from the Sandbian (Upper Ordovician) First Bani Group of the Erfoud region, Morocco. The First Bani Group was formed in a storm-dominated shelf environment below fair-weather wave base. The agglutinated tubes are found in abundance on numerous bedding surfaces, possibly representing repeated colonization between storm events, and the tube maker must have been a major part of the local ecosystem. This is the first report of Onuphionella from Ordovician rocks and the first from Gondwana. Supplementary material: Data tables for major oxide and trace element results are available at https://doi.org/10.6084/m9.figshare.c.4283612
Taphonomy of exceptional sponge preservation in the Hirnantian Anji Biota, China
Avitograptus species (Graptolithina) from the Hirnantian (uppermost Ordovician) Anji Biota of South China and the evolution of Akidograptus and Parakidograptus
Exceptional preservation of two new early rossellid sponges: the dominant species in the Hirnantian (Late Ordovician) Anji Biota of China
The putative Ordovician annelid worm Haileyia adhaerens Ruedemann, 1934 is not a recognizable fossil
A lower Silurian (Llandovery) diplobathrid crinoid (Camerata) from mid-Wales
Survival of Burgess Shale-type animals in a Middle Ordovician deep-water setting
ECHINODERM DIVERSITY AND ENVIRONMENTAL DISTRIBUTION IN THE ORDOVICIAN OF THE BUILTH INLIER, WALES
Abstract The Cambrian, Ordovician and Silurian distributions of non-stromatoporoid sponges are reviewed. The earliest Cambrian faunas contain mostly hexactinellids, with protomonaxonids dominating middle Cambrian assemblages. There are no obvious palaeobiogeographical patterns, with many genera being found widely. Vauxiids, lithistids and heteractinids are apparently confined to low latitudes, but this may be due to a poor fossil record. Most known Ordovician faunas are from low latitudes, although some high-latitude faunas are known, which contain reticulosan hexactinellids and protomonaxonids. There is some division of faunas within Laurentia, into eastern and western provinces, with the western assemblage extending across low northern latitudes during the Late Ordovician. During the Silurian Period, sponge diversity was very low during the Llandovery Epoch, probably partly owing to lack of habitat for taxa restricted to carbonate facies, and also because of sampling bias. There was a dramatic increase in diversity through the Silurian Period, mostly owing to an apparent diversification in the demosponges; however, there are many ghost lineages, indicating that their fossil record is poorly known. Non-lithistid sponges are very poorly known, with few recorded outside Euramerica. The currently available data for Early Palaeozoic sponges are too incomplete to allow any reliable palaeobiogeographical inferences. Supplementary material: the compilation of Silurian sponge occurrences is available at: http://www.geolsoc.org.uk/SUP18666 .
An unusual specimen of Glyptograptus from Dob's Linn (Southern Uplands, Scotland), and a discussion of graptolite teratomorphies
Welsh gold: A new exceptionally preserved pyritized Ordovician biota
Abstract Dennis Curry was both a businessman and a geologist. He was Chairman of Currys for many years, a job that still allowed him to spend significant time on scientific research and fossil collecting. His achievements as a scientist were impressive, with more than 120 publications and various awards from the scientific community. His collection, containing in excess of 90000 molluscs, 700 micropalaeontological slides and other material, was donated to the Natural History Museum, London. The collection contains material from all over the world, but mostly from southern England and France. His family have made funds available to ensure proper curation of the collection. The material has been sorted, reboxed and organized, and is available to researchers.